PCI-6013 intermitant bad counts good after hardware reset

I am using a PCI-6013 board to two edge separation counting into 10 bins over 1 second.  Most of the time the counter works great but some of the time I get garbage data eg 0,6050955,6050951,0,6050944,6050954,0,6051007,0,6050951.  The counts are coming from a PMT that has a max linear response of 1,000,000 counts per second.  Each data point represents 100ms of counting.  Powering the PMT off and then on has no effect.  After restarting my program the reponse returns to normal until the counts freak out again maybe 20 minutes later.  Does any one have any ideas why this is happening?

What two signals are your trying to perform a two edge separation measurement on? What do you mean by bins? What language are you doing this in and can you post your code?
Matt
Applications Engineer
National Instruments

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